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#201. Birthstone Set Round Most Safe to Fire.........................
2mm, 2.5mm, 3mm, 4mm, 5mm and 6mm are all safe to fire in metal clay. Emerald Green Cubic Zirconia has been replaced by Nano green gemstone. Metal Clay, safe to fire. Metal clay test results, Silver 1200F-1HR, Silver 1475F-1HR, Bronze 1525F-2HR, Copper 1778F-30min. Safe to use torch and safe to use carbon. All other sizes Emerald Green Cubic Zirconia (May) is not safe to fire.
Round Facet
2 mm - All safe to fire
2.5 mm All safe to fire
3 mm - All safe to fire
3.5 mm
4 mm - All safe to fire
5 mm - All Safe to fire
6 mm - All safe to fire
8 mm
List January--garnet; lab-created corundum, safe to cast in place, Safe to fire in metal clay.
February - amethyst; cubic zirconia, safe to fire in metal clay and safe to cast in place.
March - aquamarine; lab-created spinel, Safe to fire in metal clay and safe to cast in place.
April - Diamond; Safe to fire in metal clay and safe to cast in place.
May - emerald; cubic zirconia, not safe for metal clay.
June - alexandrite; lab-created corundum, safe to cast in place, may be fired in place in silver PMC at lowest heat settings.
July - ruby; lab-created corundum, safe to cast in place, safe to fire in metal clay.
August - peridot; cubic zirconia, safe to fire in metal clay and safe to cast in place.
September - sapphire; lab-created spinel, Safe to fire in metal clay and safe to cast in place.
October - tourmaline; cubic zirconia, safe to fire in metal clay and safe to cast in place.
November - topaz; cubic zirconia, safe to fire in metal clay and safe to cast in place.
December - blue zircon; lab-created spinel, Safe to fire in metal clay and safe to cast in place.